| 摘要 |
In a communication device (100) with an earpiece (110) and a microphone (120), there is a sensor (130) relating a first connection line (105) from the earpiece (110) to the microphone (120) on a system (200, 300) which is independent of the device and of the person using it, such as the earth's gravitational field, and which selects the operating mode QUIET (1) or LOUD (2) of the communication device in accordance with this. The sensor (130) switches the communication device (100) to QUIET when the angle (230) between the connecting line (105) and the plumbline (205) of the gravitational field basically corresponds to the angle (330) between a second connecting line between the ear (310) and the mouth (320) of a person (300) who is authorized to make the call, so as to bar other persons (400) who are in the vicinity (X2) from hearing the output from the communication device loudspeaker (110).
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